Which Statement Best Represents the Findings of Research on Loneliness

Which statement best represents the findings of research on loneliness?

A) Few young adults experience it.
B) People who are lonely are always depressed because loneliness causes depression.
C) It is related to low self-confidence, introversion, unhappiness, and emotional instability.
D) People in relationships rarely feel lonely or depressed because they have somebody even if that person is not an ideal partner.